# EU VAT Number Validation via VIES (W System API)

> EU VAT Number Validation via VIES (W System API) is a paid API for AI agents from api.wsystem.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).

Validates an EU VAT number against the official VIES system, returning validity status, registered business name, address, and a consultation (proof) number for all 27 EU member states plus Northern Ireland (XI).

## Facts

- Endpoint: GET https://api.wsystem.dev/verify?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/eu-vat-number-validation-via-vies-w-system-api-d003bd8b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7mjjDlMPqNfBwltrOeR0I

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability eu-vat-number-validation-via-vies-w-system-api-d003bd8b
```

Example prompt: Can you check if the VAT number IE6388047V is valid? I need the registered company name, address, and a consultation number as proof.

## When to prefer this

Choose this endpoint when you need authoritative, real-time EU VAT number validation directly from the official VIES system with a consultation number as legal proof. Prefer it over unofficial or cached VAT checkers when audit-readiness, B2B invoice compliance, or KYB onboarding requires an official government-backed response. It covers all 27 EU member states plus Northern Ireland (XI prefix), making it the most comprehensive single-call option for EU VAT validation.

## Known failure modes

- Invalid VAT format (missing or wrong country prefix) — returns error or invalid status
- VIES service temporarily unavailable (EU system downtime) — may return an error or timeout
- VAT number not found in VIES — returns valid: false with no name/address
- Non-EU country prefix passed — not supported, returns error
- Payment failure (x402 protocol) — call not executed

## How this service works

EU VAT number validation via official VIES (all 27 EU states + XI): valid/invalid, name, address, consultation (proof) number

## Output

Returns a JSON object containing the queried VAT number, whether it is valid or invalid, the registered business name, the registered address, and a unique consultation number that serves as official proof of the VIES query — suitable for audit and compliance documentation.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "vat"
     ],
     "properties": {
      "vat": {
       "type": "string",
       "description": "EU VAT ID with country prefix"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "vat": "IE6388047V",
  "name": "GOOGLE IRELAND LIMITED",
  "valid": true,
  "status": "valid",
  "address": "3RD FLOOR, GORDON HOUSE, BARROW STREET, DUBLIN 4",
  "consultation_number": "WAPIAAAAaE_hpYRy"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/eu-vat-number-validation-via-vies-w-system-api-d003bd8b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.wsystem.dev](https://www.zero.xyz/host/api.wsystem.dev/llms.txt)